UPDATE 3-Golf-Tiger wins by a stroke over Mahan at Congressional

* Woods wins by a stroke over Mahan

* Mahan's 62 ties Congressional course record

* Kim slips to third place

(adds quotes, details)

By Steve Ginsburg

BETHESDA, Maryland, July 5 (Reuters) - Tiger Woods overcame a course record-equalling performance by Hunter Mahan to win the AT&T National at Congressional Country Club Sunday.

Tournament host Woods fired a three-under-par 67 to finish at 13-under 267, one stroke better than Mahan, whose sizzling final round 62 had lifted him to the top of the leaderboard.

But Woods snapped a tie with Mahan by rolling in a 20-foot birdie putt on the par-five 16th before parring the final two holes at the pristine course outside Washington, D.C.

"It was into the left centre of the hole, and at the very end it started going left," Woods said of his birdie putt. "It was like, 'Oh, God, just don't lip out now.'